Acconeer A111-003 User Manual Download Page 16 | Manualshive

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Acconeer A111-003 User Manual Download Page 16

A111-003 Pulsed Coherent Radar
Operational description, User manual, and Installation instruction

© 2021 Copyright by Acconeer

2022-01-04

Page 16 of 36

Figure 6.2. Normalized radar loop gain radiation pattern at H-plane

6.2 Relative Phase Accuracy

Conditions: T

A

= 25 ºC, V

DD

= 1.8 V. Statistical result based on sweep count 100, 20 tested devices.

Standard deviation of phase estimation, measured at a distance of 0.35 m. Object metal cylinder, 40
mm in diameter.

Average STD of relative phase estimation:

6.1 degrees in relative phase accuracy, translates to 42 µm in relative distance accuracy.

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Summary of Contents for A111-003

Page 1: ...A111 003 Pulsed Coherent Radar Operational description User manual and Installation instruction ...

Page 2: ...accuracy fully integrated in a small package of 29 mm2 The A111 60 GHz radar system is optimized for high precision and ultra low power delivered as a one package solution with integrated Baseband RF front end and Antenna in Package AiP This will enable easy integration into any portable battery driven device The A111 is based on leading edge patented sensor technology with pico second time resolu...

Page 3: ...3 5 1 Serial Peripheral Interface 13 6 Typical Characteristics 15 6 1 Radar Loop Gain Pattern 15 6 2 Relative Phase Accuracy 16 7 Functional Description 17 7 1 Acconeer Software 18 7 2 Software Integration 18 7 3 Power Sequences 19 8 Layout Recommendations 22 8 1 Bill of Material BoM 23 8 2 XTAL 24 8 3 External Clock Source 25 8 4 Power Supply 26 9 Regulatory Approval 28 9 1 ETSI 28 9 1 1 EU type ...

Page 4: ...111 003 Pulsed Coherent Radar Operational description User manual and Installation instruction 2021 Copyright by Acconeer 2022 01 04 Page 4 of 36 1 Revision History Revision Comment V1 0 Released version ...

Page 5: ...nd an Antenna in Package AIP The sensor is based on pulsed coherent radar PCR technology featuring a leading edge patented solution with picosecond time resolution The A111 is the perfect choice for implementing high accuracy high resolution sensing systems with low power consumption Ordering information Part number Package Size nom Primary component container A111 003 T R fcCSP50 5 2 x 5 5 x 0 88...

Page 6: ...domain The PoR block generates a Reset signal on each power up cycle The host interfaces the Power functional block of the sensor via 1 8V Single power supply and ENABLE The Digital functional block includes sensor control The data memory stores the radar sweep data from the ADC The host interfaces the Sensor via an SPI interface a Clock XIN XOUT INTERRUPT signal and optional CTRL signal The Timin...

Page 7: ...ion Comment A2 NC Must no connect A3 A8 GND Ground Must be connected to solid ground plane A9 CTRL I O Optional control signal Must be connected to either host MCU or ground optional B1 NC Must no connect B2 B9 GND Ground Must be connected to solid ground plane B10 GND Ground Must be connected to solid ground plane C1 GND Ground Must be connected to solid ground plane C2 VIO_1a Supply voltage Supp...

Page 8: ...I slave select active low select J3 J5 J6 J8 GND Ground Must be connected to solid ground plane J9 VIO_3a Supply voltage Supply voltage digital part 1 J10 XIN CLK XTAL input OR external ref clk input 1 1V domain K2 SPI_CLK I O SPI Serial Clock K3 SPI_MISO I O Master Input Slave Output K4 GND Ground Must be connected to solid ground plane K5 GND Ground Must be connected to solid ground plane K6 SPI...

Page 9: ...xceed VIO_3 Stresses beyond those listed in table 4 1 may cause permanent damage to the device These are stress ratings only and functional operation of the device at these conditions or at any other conditions beyond those indicated under Recommended Operating Conditions is not implied Exposure to absolute maximum rated conditions for extended periods of time may affect device reliability 4 2 Env...

Page 10: ...ditions 1 XIN input must not exceed 0V when ENABLE is low 4 4 Electrical Specification The below table shows the A111 electrical DC specification conditions on package Top 40ºC to 85ºC Parameter Min Typ Max Unit Current into any power supply 0 100 mA I O VIL Low level input voltage 0 3 0 10 VIO_3 V I O VIH High level input voltage 0 90 VIO_3 VIO_3 0 3 V I O VOL Low level output voltage 0 0 4 V I O...

Page 11: ...the sensor states average current ratings at all power terminals VIO_1 VIO_2 VIO_3 VIO 1 8 V at Top 40ºC to 85ºC Parameter Typ Max Unit OFF VIO_1 29 139 µA OFF VIO_2 31 158 µA OFF VIO_3 0 23 µA HIBERNATE VIO_1 29 139 µA HIBERNATE VIO_2 31 158 µA HIBERNATE VIO_3 410 2064 µA SLEEP VIO_1 764 1069 µA SLEEP VIO_2 767 1082 µA SLEEP VIO_3 1 59 3 48 mA READY VIO_1 1 32 1 90 mA READY VIO_2 768 1085 µA READ...

Page 12: ...r 2022 01 04 Page 12 of 36 MEASURE PROFILE 4 VIO_1 5 20 6 86 mA MEASURE PROFILE 4 VIO_2 4 18 5 32 mA MEASURE PROFILE 4 VIO_3 62 4 81 8 mA MEASURE PROFILE 5 VIO_1 6 37 8 29 mA MEASURE PROFILE 5 VIO_2 6 06 7 61 mA MEASURE PROFILE 5 VIO_3 62 4 81 7 mA Table 4 6 Average current ratings at power terminals for the sensor states ...

Page 13: ...ot supported Host SPI Master A111 SPI Slave A111 SPI Slave SPI_CLK SPI_MOSI SPI_SS1 SPI_SS2 SPI_MISO Figure 5 1 SPI master slave connection The serial data transfer input MOSI and output MISO to the A111 are synchronized by the SPI_CLK The Slave Select signal SS must be low before and during transactions The MOSI is always read on the rising edge of SCLK and the MISO changes value on the falling e...

Page 14: ...04 Page 14 of 36 Parameter Min Typ Max Unit Clock frequency 1 50 MHz SS setup time 1 0 ns SS hold time 2 0 ns MOSI setup time 1 0 ns MOSI hold time 2 5 ns MISO propagation delay 2 5 5 ns Table 5 1 SPI timing characteristics 1 The 50 MHz clock frequency requires that the reference clock is at least 20 625 MHz 2 10pF load on SPI_MISO ...

Page 15: ...maximum main lobe value when the radar itself is used to measure the reflected power For details regarding the measurement setup refer to Hardware and physical integration guideline chapter 1 2 Conditions TA 25 ºC VDD 1 8 V Tested on 5 XR112 devices The below figure shows the Radar Loop Gain Radiation Pattern normalized to Free Space Sensor Boresight at Elevation plane E plane Figure 6 1 Normalize...

Page 16: ...adiation pattern at H plane 6 2 Relative Phase Accuracy Conditions TA 25 ºC VDD 1 8 V Statistical result based on sweep count 100 20 tested devices Standard deviation of phase estimation measured at a distance of 0 35 m Object metal cylinder 40 mm in diameter Average STD of relative phase estimation 6 1 degrees in relative phase accuracy translates to 42 µm in relative distance accuracy ...

Page 17: ...isition and signal processing The Serial Peripheral Interface SPI is a 4 wire serial bus used for configuration and reading output from the A111 radar sensor The A111 radar sensor is an SPI slave device connected to the SPI master Host MCU and allows several devices to be connected on same SPI bus with a dedicated slave select signal Daisy chain is not supported The sensor provides support for ENA...

Page 18: ...tegrated amplitude data in pre defined range intervals IQ modulated data representation in cartesian etc Detectors are built on Service data as input and the output is a result E g Distance detector that presents distance and amplitude result based on envelope Service etc Customer can either use Acconeer detector or develop their own signal processing based on Service data Acconeer provides severa...

Page 19: ... The power up sequence is described using the recommended integration shown in the below figure A111 INTERRUPT SPI_SS SPI_MISO SPI_MOSI SPI_CLK ENABLE VIO_1a b VIO_2a b VIO_3a b VBIAS XIN XOUT GNDs 1 8V X1 C5 C4 R1 C1 C2 C3 Host CTRL R2 Figure 7 3 Recommended integration of the A111 radar sensor The power up sequence is shown in below figure ...

Page 20: ...BLE is high The time constant t1 in figure 7 4 denotes this time The actual value of t1 depends on the power supply and the decoupling capacitors used If the CTRL signal is used it must be held at 0V during time t1 Next step in the power up sequence is to have a settling time for the XTAL oscillator to stabilize shown as time t2 in figure 7 4 This may take up to several milliseconds depending on t...

Page 21: ...ensor The power down sequence is described in Figure 7 5 Figure 7 5 The power down sequence The power down sequence is initiated by setting ENABLE low The crystal oscillator will be disabled when ENABLE is set low If an external reference clock is used it is advised to disable it simultaneously with ENABLE After that VIO_1 2a b can be turned off Time constant t3 refer to Figure 7 5 later VIO_3a b ...

Page 22: ... below the sensor should be continuous and should have low impedance The below table shows the sensor gain loss versus solid ground plane area Ground plane area Sensor gain loss 625 mm2 0 dB 425 mm2 0 2 dB 225 mm2 0 4 dB 127 mm2 2 2 dB 29 mm2 4 0 dB Table 8 1 Simulated relative maximum gain as function of extended solid ground plane area The area is quadratic It is recommended to keep the layout a...

Page 23: ...M for integration of the A111 Component Value Description C1 C2 C3 1 µF VIO_1 VIO_2 VIO_3 decoupling R1 R2 100 kΩ INTERRUPT and CTRL pull down resistor X1 XTAL 24 MHz Epson TSX 3225 optional C4 C5 8 pF 1 XTAL freq tuning capacitor optional Table 8 2 BOM list 1 See details in chapter 7 1 XTAL for C4 C5 value calculation See figure 8 1 that shows the optional XTAL populated ...

Page 24: ...it is connected to XIN C4 C5 GND GND GND XOUT XIN TSX 3225 XTAL 26 MHz I O GND I O GND Figure 8 1 External XTAL schematics To enable the internal XTAL oscillator to drive the external resonator the relation in equation 1 must be fulfilled Equation 1 𝑓 𝐶𝑝𝑖𝑛 0 8 𝑅𝐸𝑆𝑅 0 61 0 7 Equation 2 𝐶 2 𝐶𝐿 𝐶𝑠𝑡𝑟𝑎𝑦 Equation 3 𝐶𝑝𝑖𝑛 𝐶 𝐶𝑠𝑡𝑟𝑎𝑦 2 The capacitance values are calculated in equation 2 CL and RESR are XTAL ...

Page 25: ...igin from an external clock source connected to XIN with XOUT left open As an example given in table 8 3 maximum phase noise figures are given using 40 MHz external clock reference Offset frequency Hz Min Typ Max Unit 1000 80 dBc Hz 10 000 100 dBc Hz 100 000 120 dBc Hz 1 000 000 140 dBc Hz 10 000 000 155 dBc Hz Table 8 3 Phase noise using 40 MHz external clock reference ...

Page 26: ...d power supply ripple specification for VIO_3 Low cost LC filter solution Acconeer provides recommended low cost LC filter solution the recommended filter is displayed in figure 8 2 The values of the component demonstrate an example filter design exact values depend on switching frequency and ripple amplitude of the supply regulator However be aware of LC filter peaking at the series resonance fre...

Page 27: ...003 Pulsed Coherent Radar Operational description and User manual Page 27 of 36 2022 01 04 2021 Copyright by Acconeer Figure 8 3 Simulated performance with 10mVpp supply ripple with low cost LC supply filter ...

Page 28: ...o be noted is that some regulatory specifications also specify the usage of the sensor so users of the sensor must check regulatory requirements for their own use case and determine if the regulatory approvals described below are sufficient 9 1 ETSI Hereby Acconeer declares that the A111 sensor is compliant with directive 2014 53 EU 9 1 1 EU type examination certificate ...

Page 29: ...fied for compliance with all the technical specifications applicable to operation under 47 CFR Part 15 with the exception of the following provisions in 47 CFR 15 255 a 2 and c 3 which are waived to allow the device to operate as a radar on new passenger motor vehicles in the 57 64 GHz band at 5 duty cycle evaluated in 0 125 μs time averaged windows at a 3 dBm average EIRP evaluated in 0 125 μs ti...

Page 30: ...ior of new passenger motor vehicles for the primary purpose of in cabin monitoring functions and shall not be marketed in after market add on products Intended uses are restricted to vehicle bound applications like passenger presence detection to include children inadvertently left in vehicles in hot weather seat belt reminder airbag suppression intruder alarm and automotive access gesture control...

Page 31: ...e electromagnetic waves at least in one plane of radiation E or H plane 2 8 Label and compliance information The host device shall be labelled to identify the modules within the host device which means that the host device shall be labelled to display the FCC ID of the module preceded by words Contains transmitter module or Contains E g Contains FCC ID 2AQ6KA1003 If the module is installed such th...

Page 32: ...le in fcCSP package for mounting on a substrate The below table shows mechanical data Parameter Min Typ Max Unit Body X 5 15 5 20 5 25 mm Body Y 5 45 5 50 5 55 mm Body Z height 0 821 0 899 mm Ball pitch 0 45 0 50 0 55 mm Ball diameter 0 25 0 30 0 35 mm Ball height 0 15 0 24 mm Ball count 50 Table 10 1 Mechanical data The A111 footprint is shown in Figure 10 1 Figure 10 1 A111 footprint ...

Page 33: ...and User manual Page 33 of 36 2022 01 04 2021 Copyright by Acconeer The physical layout of the A111 sensor is shown in Figure 10 2 10 3 and 10 4 Figure 10 2 Physical layout of the A111 sensor top view Figure 10 3 Physical layout of the A111 sensor side view ...

Page 34: ...nd Recommended Reflow Profile Acconeer A111 sensor is a Moisture Sensitive Devices MSD in accordance to the IPC JEDEC specification The Moisture Sensitivity Level MSL relates to the packaging and handling precautions required A111 sensor is rated at MSL level 3 Maximum number of reflow passes recommended for A111 is 2 Soldering process qualified during qualification with Preconditioning MSL 3 30 C...

Page 35: ...er ESD Electrostatic discharge ETSI European Telecommunications Standards Institute FCC Federal Communications Commission fcCSP Flip chip chip scale package GND Ground HAL Hardware abstraction layer HPBW Half power beamwidth LDO Low dropout regulator MCU Microcontroller unit MISO Master input slave output MOSI Master output slave input NC No connect PCR Pulse coherent radar PLL Phase locked loop P...

Page 36: ...e for any failure to meet such industry standard requirements Unless explicitly stated herein this document Acconeer has not performed any regulatory conformity test It is the user s responsibility to assure that necessary regulatory conditions are met and approvals have been obtained when using the product Regardless of whether the product has passed any conformity test this document does not con...

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